Tenergy 4.8vdc, high quality, high capacity, and low weight (4.0 oz) 4 cell NiMh pack with Hitec male universal connector for your CDI ignition system or flight pack. These packs are rated at 2000 Mah capacity. We sold thousands of these packs over the last 3 years.....they are well made and reliable. Domestic shipping is $4.99 for 1-6 packs.